JPH075019B2 - Vehicle refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cold storage refrigerator for vehicles, which is suitable for use in automobiles that are highly oriented for leisure purposes.

[Conventional technology]

Conventionally, as a vehicle cold storage refrigerator, as described in JP-A-59-50828, cold storage material (water, etc.) in a cold storage device.
It has been proposed that the vehicle be cooled by an evaporator branched from a refrigeration cycle of a vehicle air-conditioning apparatus and frozen, and that the frozen regenerator material can keep the inside of the refrigerator at a low temperature for a long time even during parking.

[Problems to be solved by the invention]

However, in the above conventional product, since the regenerator material and the evaporator of the refrigeration cycle are arranged inside the regenerator, it is difficult to secure the sealability of the regenerator material, and the manufacturing cost of the regenerator is high. In addition, there is a problem that the cold storage effect is inferior because the cold storage material cools during cold storage due to the non-wind endothermic action.

The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle refrigerator in which a cold storage type refrigerating function can be obtained with an extremely simple configuration.

[Means for solving problems]

The present invention, in order to achieve the above object, a heat insulating case having a lid body that can be opened and closed, a cold storage cooler installed in the case and having a cold storage material sealed in a bag, and in the case, A refrigerating evaporator that is arranged so as to be in close contact with the refrigerating cool storage body and is provided by branching from a refrigerating cycle having a cooling evaporator; Means for setting to a low value that can be frozen, a temperature detector for detecting the surface temperature of the refrigerating evaporator or its related temperature, and a blower provided in the case and driven by an on-vehicle battery, The blower employs a technical means that is activated when the temperature detected by the temperature detector is equal to or lower than the freezing temperature of the regenerator material.

[Action]

According to the above means, it is possible to cool the regenerator for refrigeration and freeze the regenerator by simply adhering the regenerator for refrigeration in which the regenerator is sealed in the bag and the evaporator for refrigeration. It becomes easy to secure the sealing property of the material.

Further, when the cold storage material is at the freezing temperature or lower, the blower operates to agitate the air in the case (refrigerator), so that the heat absorption effect of the cold storage material in the refrigerator is promoted.

〔Example〕

 The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 shows one of the places where the vehicle refrigerator A according to the present invention is arranged.
This is an example, and in this example, it is installed in a trunk room B at the rear of the automobile. The cooling unit 1 of the refrigerator A is attached to the vehicle body by a stay or the like (not shown), and the cold insulation unit 2 is detachably attached to the cooling unit 1 by a metal fitting 3. The lid 4 is configured to be bendable by a hinge portion 4a at the center thereof, and when the cold insulation unit 2 is detached from the cooling unit 1 and used as a simple cold insulation box, the opening of the cold insulation unit 2 is closed by the lid 4. Has become.

1 and 3 show the external appearance of the cooling unit 1, the cooling unit 2 and the lid 4, and FIG. 1 shows the cooling unit 1.
3 shows a state in which the cold insulation unit 2 is connected to the cold insulation unit 2. FIG. 3 shows a state in which the lid 4 is attached to the cold insulation unit 2 to be used as a cold insulation box. At this time, the cooling unit 1a of the cooling unit 1 is As shown in FIG. 3, since it is covered by the lid 1b connected by the hinge portion 1c, the appearance is good and the trunk room B is used when the refrigerator is not used.
Can be widely used.

FIG. 4 shows a section I of FIG. 1, and FIG. 5 shows a section of FIG.
II is shown, and FIG. 6 shows a section III of FIG.

The cooling unit 1a is composed of a cooling device 5 and a case 6 having a recess 6c for accommodating the cooling device 5 and two holes 6d for piping of the cooling device 5, and the cooling device 5 includes a stay (not shown). It is fixed to the recess 6c of the case 6. The case 6 is an integrally molded product of resin, and the heat insulating effect is enhanced by foaming and injecting a heat insulating material 6a such as hard urethane foam having a high heat insulating property inside.

The cooling device 5 includes a high pressure pipe 5a and a predetermined set pressure, for example, 1.2 kg /
Constant pressure expansion valve 5b that opens at cm ² G, branch pipe 5c, evaporator 5d for a refrigerator composed of a meandering flat tube, inside the refrigerator when the refrigerant is not flowing to the evaporator 5d when parking. A regenerator 5e having a regenerator material (for example, water) enclosed therein for keeping the temperature low, a check valve 5f, and a low-pressure pipe 5g. The regenerator 5e uses a bag that is easily deformable (for example, a bag made of aluminum foil), and a large number of it is pushed between the flat tubes of the evaporator 5d and is in thermal contact with the tube surface. Further, a heat insulating packing 6b or the like is packed in the gap between the case 6 and the cooling device 5.

In the evaporator 5d, the regenerator 5e located on the most downstream side in the refrigerant flow direction is estimated to measure the freezing degree of the regenerator material by measuring the surface temperature of the regenerator 5e as shown in FIG. A temperature sensor (for example, a thermistor) 8 is attached to the flat tube of the evaporator 5d via a heat insulating material 7 made of a resin having a high heat insulating property.

The lid 1b of the cooling unit 1 includes a case 9, a motor 10, a sirocco fan 11, and a cover 13. Case 9
Is a resin integral molding having a scroll portion for the sirocco fan 11 and a concave portion 9a forming an air outlet.
Insulation material such as hard urethane foam with high heat insulation inside
9b is foamed and injected. The motor 10 is fixed to the case 9 by a bracket (not shown). The motor 10 of the blower composed of the sirocco fan 11 and the motor 10 is directly supplied with electric power from an on-vehicle battery 16 via two temperature switches (for example, thermal reed switches) 14 and 15, as shown in FIG. One of the temperature switches 14 is attached to the surface of the evaporator 5d as shown in FIG. 6, and is set so as to be closed when the surface temperature of the evaporator is 0 ° C. or lower and opened when it is 5 ° C. or higher. The other temperature switch 15 is attached to the outer surface of the case 6 as shown in FIGS. 4 and 5, and closes when the ambient temperature of the refrigerator reaches a set temperature, for example, 35 ° C. or higher, and opens at 30 ° C. or lower. Is set to be When the cool storage material of the cool storage body 5e is frozen and the ambient temperature of the refrigerator is high, the motor 10 is energized to rotate the fan 11 to improve the cooling performance in the refrigerator. Further, the cover 13 is made of resin, is fixed to the case 9 by screws or the like, and has a suction port 13a for the air inside the refrigerator.

In the configuration of this example, the sirocco fan 11 is made of resin, and as shown in FIG. 9, the shaft mounting boss 11a of the motor 10, the fan blade portion 11b, both of these portions 11a,
An arm portion 11c connecting 11b is provided, the arm portion 11c is located on the side of the air intake port 13a, and air is sucked from the side of the arm portion 11c. Therefore, the arm part 11
In order that c does not hinder the inflow of air, the cross-sectional shape of the arm portion 11c is formed obliquely with respect to the air inflow direction (arrow B direction) as shown in FIG. In FIGS. 9 and 10, the arrow a indicates the direction of fan rotation.

On the other hand, the cold insulation unit 2 includes a case 18, a louver 19 and a handle portion 17. The case 18 is an integrally molded product of resin, and a heat insulating material 18a such as hard urethane foam having a high heat insulating property is foamed and injected therein. The handle 17 is rotatably attached to the side surface of the case 18 by a bracket 17a. The louver 19 is made of resin, and is inserted into the recess 18b of the case 18 in a multiplicity of stages in the vertical direction. The louver 19 functions to rectify the circulating air flow in the refrigerator, and when the cooling unit 2 is separated from the cooling unit 1, The function of preventing the stored items from falling outside.

Like the other cases, the lid body 4 is also an integrally molded product of resin in which a highly heat insulating material such as hard urethane foam is foam-injected. FIG. 11 shows an automobile refrigeration cycle for cooling the passenger compartment and refrigerating the articles.
Is connected to a drive shaft of an automobile engine (not shown) via an electromagnetic clutch 20. This compressor 21 is
A 10-cylinder swash plate type compressor is used, of which 9 cylinders are configured as a main compression section 21a for cooling and the remaining 1 cylinder is configured as a sub compression section 21b for refrigeration. In this case, each of the compression sections 21a and 21b of the compressor 21 has a cooling suction port 21e.
And a refrigerating suction port 21f are independently provided, and each compression unit can independently set different suction pressures. In addition, the cooling compression unit 21a and the refrigeration compression unit 21b
Are communicated with each other by a communication passage 21d, and each suction port 21e, 2
Refrigerants (R12) with different pressures, respectively, drawn from 1f
Is communicated by the communication passage 21d before being compressed in each compression unit 21a, 21b, and after being increased to the pressure of the cooling medium, is compressed in each compression unit 21a, 21b, and the common discharge port 21c.
Is discharged from the compressor to the outside.

Next, a specific configuration of the compressor 21 will be described with reference to FIGS. 12 and 13. The compressor 21 of the present embodiment is a shaft driven by an automobile engine via an electromagnetic clutch 20.
A swash plate type in which the rotational force of 210 is converted into the reciprocating motion of the piston 212 by the swash plate 211.
It is keyed to 10 and rotates together with it. The rotation of the swash plate 211 is transmitted to the piston 212 via the shoe 213 and the ball 214. There are five pistons 212, the surface of which is coated with a resin material such as Teflon. These pistons 212 are axially reciprocally arranged in five cylinder bores (one bore 216 is shown in FIG. 12) formed in a cylinder block 215. Both ends of piston 212 are cylinder bore 2
Coordinate with 16 to form 10 cylinders (cylinder chambers) 217, 217a, and one of the 10 cylinders 217a
Constitutes the refrigeration sub-compression section 21b in FIG. 11, and the remaining cylinders 217 compose the cooling main compression section 21a.
A shaft hole for the shaft 210 and a swash plate chamber 218 accommodating the swash plate 211 are formed in the center of the cylinder block 215.
The swash plate chamber 218 communicates with the cylinder bore 216. On the other hand, an oil chamber 219 that is normally filled with lubricating oil is also formed in the lower portion of the cylinder block 215.

End plates 222 and 223 are attached to both end surfaces of the cylinder block 215 via an annular valve plate 220 and an intake valve 221 formed of an elastic metal plate.
0, 221, 222, and 223 are fixed to each other by through bolts 224. Five intake ports 225 are formed in each of the left and right valve plates 220, 220, and these intake ports 225 can communicate with the ten cylinders 217, 217a via the intake valves 221 respectively.

Both end plates 222 and 223 have the same structure, but one end plate 222 is provided with a refrigerating suction port 21f which is a sub-suction port, and the other end plate 223 is provided with a shaft 210 rotatably. They differ from each other in that there is a central hole 226 therethrough. The both end plates 222, 223 have a dish shape, and substantially circular partition walls 227, 228 are axially protruded on the inner side surfaces thereof, and the insides of the partition walls 227, 228 serve as discharge chambers 229, and The suction chamber 23 is provided between the walls 227 and 228 and the outer peripheral walls of the end plates 222 and 223.
1 is formed. The end plate 222 has a partition wall 233 different from the partition wall 227, and this partition wall 233 connects the auxiliary suction chamber 234 to the suction chamber 2
End plate 22 even at the point of partitioning from 31 (see Fig. 13)
Different from 3. The sub-suction chamber 234 is provided with the refrigeration suction port 21f. The auxiliary suction chamber 234 communicates with the cylinder 217a through a suction port 225 corresponding to the cylinder 217a,
On the other hand, the suction chamber 231 communicates with all the remaining cylinders 217. The left and right valve plates 220, 220 are provided with five discharge ports 235 respectively corresponding to five cylinders, and these discharge ports 235 are opened and closed by a discharge valve (not shown) and communicate with the discharge chamber 229 when they are opened. . The discharge chamber 229 is connected to the discharge port 21 shown in FIG. 11 through the passage 236 shown in FIG.
communicate with c.

As is clear from the above description, one cylinder 217a that can communicate with the sub-suction chamber 234 constitutes the sub-compression section 21b for refrigeration, and the other nine cylinders 217 form the main compression section 21a for cooling. I am configuring. The cooling suction port 21e, which is the main suction port, is provided in the upper portion of the outer peripheral surface of the cylinder block 215 as shown in FIG. 12, and communicates with the swash plate chamber 218 by the structure described later. The swash plate chamber 218 has a passage formed by a gap between the through bolt 224 and the bolt hole 224a, and the left and right suction chambers 23
Communicate with 1. Therefore, the refrigerant flowing from the swash plate chamber 218 into the suction chamber 231 is sucked into all the cylinders 217 other than the cylinder 217a through the suction port 225. On the other hand, the refrigerant that has flowed into the sub-suction chamber 234 from the refrigeration suction port 21f is sucked into the cylinder 217a, that is, the sub-compression section 21b through the suction port 225 corresponding to the cylinder 217a.

In order to connect the cooling suction port 21e and the swash plate chamber 218, a communication groove 237 is formed in the inner surface of the cylinder bore 216 at the axial center of the cylinder bore 216.
It extends circumferentially over a portion of the inner piston 212 around. The communication groove 237 directly opens to the swash plate chamber 218, and at the same time, the cooling suction port 21 is provided through a communication hole (not shown).
It communicates with e.

The discharge port 21c (Fig. 11) of the compressor 21 is a cooling air intake port 21e.
It is provided on the upper side of the outer surface of the cylinder block 215 in a state of being lined up with, but not shown in FIG. This discharge port 21c passes through the passage 236 shown in FIG.
It communicates with the discharge chambers 229 and 229 in 222 and 223.

The communication passage 21d shown in FIG. 11 has a circumference formed on the inner peripheral surface of this cylinder 217a over the entire circumference at a position near the bottom dead center of the piston 212 in the cylinder 217a forming the sub compression portion 21b. Direction annular groove 238, which groove 238
Is a plurality of axial communication holes 23 that are formed in the peripheral wall of the cylinder 217a so as to surround the piston 212 and are circumferentially separated from each other.
It is always in communication with the swash plate chamber 218 and the communication groove 237 through the line 9. Therefore, the piston 212 in the cylinder 217a moves in the direction of the arrow G in FIG. 12 to suck the low-pressure refrigerant from the refrigerating suction port 21f through the auxiliary suction chamber 234 and the suction port 225, and the piston 212 then bottoms. When reaching the vicinity of the point and opening the annular groove 238 in the circumferential direction in the cylinder 217a, this time the low-pressure refrigerant for cooling passes from the groove 237 and the swash plate chamber 218 through the communication hole 239 and the annular groove 238 forming the communication passage 21d. Flow into cylinder 217a,
It mixes with the low-pressure refrigerant for refrigeration in this cylinder. here,
Assuming that the pressure of the low-pressure refrigerant for refrigeration is 1.2 kg / cm ² G and the pressure of the low-pressure refrigerant for cooling is 2.5 kg / cm ² G, there is a communication passage inside the cylinder 217a.
When the cooling low-pressure refrigerant flows through 21d and mixes with the refrigerating low-pressure refrigerant, the pressure of the refrigerant in this cylinder 217a is the pressure at the time of starting compression of the other cylinder 217 constituting the main compression portion 21a, That is, it is almost equal to 2.5 kg / cm ² .
Therefore, the compression stroke in the cylinder 217a is
Starting from almost the same pressure as the compression start pressure, the compressed refrigerant is discharged into the common discharge chamber 229 and merges with the refrigerant discharged from the other cylinder 217, and passes through the passage 236 to the discharge port 21c of FIG. It is discharged toward the condenser 22.

Therefore, since the refrigeration sub-compression section 21b can compress the refrigerant by the piston from the same pressure state as the cooling main compression section 21a, the compressor 21 compresses from different suction pressure states. Power saving compared to.

Further, the compressor 21 can be applied to a vane type compressor in addition to the swash plate type multi-cylinder compressor as described above. In that case, if the suction port 21f for cooling and the suction port 21e for cooling are opened in the ascending order of suction pressure according to the rotation method of the rotor, the respective compression parts 21b, 21a will all have the highest suction pressure of 2.5 kg / cm ² . It is possible to start the compression in the closed state. As described above, the compressor 21 of the present embodiment is provided with independent suction ports 21e and 21f in the compression units 21a and 21b, respectively, and it is possible to set the suction pressure of each compression unit independently. Become.

The discharge port 21c of the compressor 21 is connected to the condenser 22 as shown in FIG. 11, and the discharge side of the condenser 22 is connected to the receiver 23. On the discharge side of the receiver 23, a pressure reducing device for cooling,
In this example, a temperature-operated expansion type 24 and a cooling evaporator 25 connected thereto are provided, and a cooling air blower fan 50 is arranged on the air upstream side of the evaporator 25. .
The refrigerant outlet side of the evaporator 25 is connected to the cooling intake port 21e of the compressor 21 via the evaporation pressure adjusting valve 30 by the cooling intake pipe 45. The valve 30 prevents the frost of the evaporator 25 by controlling the evaporation pressure of the cooling evaporator 25 to a set pressure.

On the other hand, the constant pressure expansion valve 5b of the cooling device 5 in the cooling unit 1 described above, the refrigerator evaporator 5d connected to the constant pressure expansion valve 5b, and the check valve 5f are the cooling expansion valve 24 and the evaporator 25. It is provided in parallel. The check valve 5f is for passing the refrigerant gas only in one direction to the compressor suction side,
The discharge side of the check valve 33 is connected to the refrigerating suction port 21f of the compressor 21 by a refrigerating suction pipe 46. The constant pressure expansion valve 5b is opened when its downstream pressure, that is, the pressure of the refrigerating evaporator 5b is reduced to a set pressure, for example, 1.2 kg / cm ² G or less. For refrigerant R12, the evaporation temperature corresponding to the above evaporation pressure (1.2 kg / cm ² G) is -10.5 ° C.
Is.

A communication pipe 47 is provided to connect the cooling suction pipe 45 and the refrigeration suction pipe 46, and a solenoid valve 48 is provided in the communication pipe 47.
Is provided, and the suction pipes 45 and 46 are opened by opening the solenoid valve 48.
Are communicating with each other.

Next, the electric circuit of this embodiment will be described. In FIG. 11, reference numeral 16 is an on-vehicle battery, and a refrigerator control circuit 51 is connected to the battery 16 via a cooling switch 52 and a refrigerator switch 53.

The temperature sensor 8 provided to detect the surface temperature of the regenerator 5e cooled by the refrigerator evaporator 5d is connected to the refrigerator control circuit 51, and the refrigerator control circuit 51 detects that the temperature detected by the temperature sensor 8 is the first. When the set temperature of 1 is, for example, −6 ° C. or lower, the solenoid valve 48 is de-energized and the solenoid valve 48 is opened. The control circuit 5 causes the lamp, when the temperature detected by the temperature sensor 8 is slightly higher than the first set temperature and drops to the second set temperature, for example, -4 ° C.
A display device 54 such as an LED is turned on to display the completion of freezing of the cold storage material.

The display device 54 is installed on the outer surface of the refrigerator cooling unit case described above and on the instrument panel of the vehicle.

Further, the electromagnetic clutch 21 is energized via the cooling control circuit 55 by turning on the cooling switch 52.

Next, the operation of this embodiment will be described. FIG. 14 is a Moluel diagram of the refrigeration cycle. In the figure, the solid line 90 represents the operating characteristics of the refrigerating cycle for cooling, and the alternate long and short dash line 91 represents the operating characteristics of the refrigerating cycle for refrigeration. In FIG. 11, when the cooling switch 52 is turned on, the electromagnetic clutch 20 is energized via the cooling control circuit 55, so that the electromagnetic clutch 20 is in the connected state and the driving force of the automobile engine is transmitted to the compressor 21. Then, the compressor 21 rotates and compresses the refrigerant gas.

In the above state, when the operation switch 53 of the refrigerator is further turned on, power is supplied to the control circuit 51, but at the time of starting, the surface temperature of the cold storage body 5e for refrigeration is the first set temperature (for example, -6 ° C).
Since it is higher, the control circuit 51 compares the detection signal of the temperature sensor 8 with the reference signal, outputs the "Hi" level output, and energizes the solenoid valve 48, so that the solenoid valve 48 remains closed.
Since the display device 54 is not energized, the display device 54 remains off. Since the solenoid valve 48 is closed, the cooling refrigerant from the cooling suction pipe 45 flows into the main suction port 21 of the compressor 21.
The refrigerant for refrigeration from the refrigeration suction pipe 46 is supplied to the compressor 2
Each is independently sucked into the sub-suction port 21f.

Here, since the refrigeration compression section 21b in the compressor 21 communicates with the cooling compression section 21a via the communication passage 21d at the end of the suction stroke (near bottom dead center) as described above, the refrigeration compression section 21b The pressure rises to the same pressure as the cooling side, that is, 2.5 kg / cm ² G due to the refrigerant inflow from the cooling compression unit 21a (see FIG. 14).
P ₆ → P ₃₎ to. Therefore, both compression units 21a and 21b have 2.5
Compress the refrigerant at a pressure of kg / cm ² G (P ₃ → P _{4 in} Fig. 14).
The compressed refrigerant gas is mixed with the discharge port 21c.
Is discharged from the condenser 22 by the condenser 22 (P ₄ →
P ₁ ) will be.

This liquefied refrigerant is stored in the receiver 23 and reduced in pressure (P ₁ → P ₅ and P ₅ by the action of the constant pressure expansion valve 5b and the temperature-operated expansion valve 24).
P ₁ → P ₂ ) and then evaporated (P ₅ → P ₆ and P ₂ → P ₃ ) in the evaporators 5d and 25, respectively. Here, point P ₁ represents the state of the high-pressure refrigerant on the inlet side of the temperature-operated expansion valve 24, P ₂ represents the state of the refrigerant on the discharge side of the expansion valve 24, and P ₃ represents the main cooling compressor section. 21a represents the state of the refrigerant at the inlet 21e, and P ₄ represents the state of the refrigerant at the outlet 21c. In the refrigeration cycle, the state of the refrigerant downstream of the constant pressure expansion valve 5b is set to P ₅ by appropriately setting the valve opening pressure of the constant pressure expansion valve 5b. Specifically, it is possible to maintain the evaporation pressure of the evaporator 5d at 1.2 kg / cm ² G by the action of the constant pressure expansion valve 5b. As described above, the evaporation pressure in the refrigerating evaporator 5d is 1.2 kg /
By keeping it at cm ² G, the refrigerant evaporation temperature is -10.5 ° C.
It is possible to carry out a refrigerating action (cooling action for a cold storage material) by holding the above.

Here, in detail about this refrigerating action, by keeping the refrigerant evaporation temperature in the refrigerating evaporator 5d at a low temperature of -10.5 ° C as described above, the cool storage body 5e closely arranged between the flat tubes of the evaporator 5d can be obtained. Can be cooled rapidly. In this case, the cold storage bodies 5e located on the refrigerant inlet side of the flat tubes of the refrigerating evaporator 5d are sequentially frozen, and the cold storage bodies 5e on the refrigerant outlet side are finally frozen. When the freezing of the cool storage body 5e on the refrigerant outlet side is completed and the surface temperature of the cool storage body 5e drops to the second set temperature, for example, -4 ° C, the control circuit 51 determines the detection signal of the temperature sensor 8. Then, since the output of the "Hi" level is given to the display device 54, the display device 54 is turned on to display the completion of freezing (cooling storage) of the regenerator 5e. And
When the surface temperature of the refrigerating cool storage body 5e on the refrigerant outlet side drops to a first set temperature lower than the second set temperature, for example, −6 ° C., the control circuit 51 determines the detection signal of the temperature sensor 8, The power supply to the solenoid valve 48 is cut off and the solenoid valve 48 is opened. Then, since the communication pipe 47 is opened, the refrigerant on the cooling side passes through the communication pipe 47 and the refrigerating suction port of the compressor 21.
It will also flow into 21f. As a result, the pressure in the refrigeration suction pipe 46 rises to the refrigerant pressure on the cooling side (2.5 kg / cm ² G), so the constant pressure expansion valve 5b remains closed thereafter, and all the cylinders of the compressor 21 are cooled. Used for. The check valve 5f prevents the refrigerant on the cooling side from flowing back to the refrigerating evaporator 5d, so that the inside of the evaporator 5d is kept at a low temperature for a while.

The reason why the temperature at which the solenoid valve 48 is opened (first set temperature) is lower than the temperature at which the display device 54 is turned on (second set temperature) is that the solenoid valve 48 is opened. This is to prevent the problem that the surface temperature of the regenerator 5e rises in a short time and the display device 54 returns to the off state.

As described above, when the cold storage cooler 5e completes freezing, even if the vehicle engine is stopped and the compressor 21 is stopped, such as when parked, the latent heat of melting of the cool storage body 5e cools the inside of the cold insulation unit 2 for a long time. It can be maintained at a low temperature near the freezing temperature of the material.

On the other hand, if the temperature switch 14 provided in the evaporator 5d is below the set temperature (for example, 0 ° C.) and the temperature switch 15 that detects the ambient temperature of the refrigerator is above the set temperature (for example, 35 ° C.), both of the above Since both switches 14 and 15 are closed,
The motor 10 is energized, and the fan 11 circulates cold air in the vicinity of the cooling device 5 inside the cold insulation unit 2 to forcibly cool the inside of the refrigerator. Here, since the motor 10 is directly connected to the battery 16 via the temperature switches 14 and 15 as shown in FIG. 8, when the refrigerator ambient temperature is equal to or higher than the set temperature, the fan 11 continues to rotate even after parking. However, when the regenerator 5e is completely melted, the temperature of the temperature switch 14 rises above the set temperature and the switch 14 opens, so that the power supply to the motor 10 is stopped and the vehicle battery 16 is prevented from being over-discharged. . When the ambient temperature of the refrigerator is equal to or lower than the set temperature of the temperature switch 15, the switch 15 is opened, so the fan 11 is always stopped.

Here, the temperature switch 14 provided in the refrigerating evaporator 5d
Using the (temperature detector in the present invention) and the temperature switch 15 for detecting the ambient temperature of the refrigerator together makes it possible to use the in-vehicle battery 16
It is desirable to prevent over discharge of the temperature switch
Even if the fan 11 is operated and stopped based on the set temperature of only 14, it is possible to sufficiently achieve the forced cooling of the inside of the refrigerator by the cold storage material and the prevention of the over-discharge of the on-vehicle battery 16.

It should be noted that the temperature switch 14 can indirectly detect the temperature of the regenerator material by changing the set temperature even if the temperature switch 14 detects the related temperature instead of detecting the surface temperature of the refrigerating evaporator 5d.

On the other hand, after sufficiently cooling the object to be cooled inside the cold insulation unit 2 as described above, the cold insulation unit 2 and the cold insulation unit 1 are separated, and the lid 4 is attached to the cold insulation unit 2 as shown in FIG. For example, the cold insulation unit 2 can be taken out of the vehicle.

Further, in the case where only the vehicle interior is cooled, the refrigerator switch 53 is opened, the solenoid valve 48 is de-energized, and the solenoid valve 48 is always opened to remove all the refrigerant from the cooling evaporator.
In addition to being able to flow to 25, all cylinders of the compressor 21 are used for cooling.

15 and 16 show another embodiment of the present invention,
The cooling unit 1 and the cold insulation unit 2 in the above-described example have an integral structure that cannot be separated. In the figure, 100 is a case of a so-called double wall structure using a double resin member made of polyethylene or polypropylene. In order to improve heat insulation, a heat insulating material such as hard polyurethane is provided between the double wall structures. 101 is infused. Then, in the case 100, a refrigerator lid 103 in which a heat insulating material 102 such as hard polyurethane is injected into a resin member having a similar double wall structure is hinge 10.
A rubber member (not shown) containing a magnet is fixed to the peripheral portion of the upper end surface of the case 100, and the rubber member is fixed to the peripheral portion of the door 103. It is designed to be securely attracted and fixed to an iron plate (not shown) by magnetic force.

As shown in FIG. 16, both the constant pressure expansion valve 5b and the check valve 5f are arranged in the case 100, and the constant pressure expansion valve 5b
The refrigerating evaporator 5d connected to the downstream side of the
As shown in the figure, it is composed of a meandering tube having a circular pipe in cross section, and is arranged along the entire length of the inner surface of the case 100.
The tube is made of a material such as copper or aluminum.

And, inside the meandering tube of the evaporator 5d for refrigeration,
The regenerator 5e for refrigeration is arranged so as to be in close contact with the regenerator, and the regenerator 5e is obtained by sealing the regenerator material inside the easily deformable bag made of aluminum foil as in the above example. , Many are juxtaposed.

After arranging the evaporator 5d and the regenerator 5e as described above, a metal cooling plate 105 having excellent thermal conductivity such as aluminum or stainless steel is placed inside the regenerator 5e in close contact with the regenerator 5e. It is set up. The cooling plate 105 is formed in a square shape having an upper surface and a lower surface opened, and a portion near the upper end thereof is fastened and fixed to the case 100 by a screw 106.
The temperature sensor 8 for detecting the temperature of the cold storage 5e for refrigeration is
As shown in the figure, it is arranged between the regenerator 5e positioned at the most downstream side of the meandering tube of the refrigerating evaporator 5d and the cooling plate 105, and is closely fixed.

Also in this example, the configuration of the refrigeration cycle, the compressor, etc. is the same as that of FIG. 11 described above, and therefore, the same operation as that of the above example can be achieved except that it cannot be taken out of the vehicle.

In this example, since the fan 11 in the above example is not provided, the inside of the refrigerator is cooled by natural convection.

The present invention is not limited to the illustrated embodiments described above,
Various modifications are possible as described below.

(1) When the swash plate type multi-cylinder compressor is used as the compressor 21, the refrigerating compression section 21b may be increased not only in one cylinder but also appropriately in accordance with the required capacity of the refrigerator.

(2) The temperature sensor 8 in the refrigerator may detect the temperature inside the refrigerator in addition to the surface temperature of the cold storage body 5e for refrigeration, or may use a temperature switch using a reed switch instead of the thermistor. Good.

(3) As the pressure reducing device on the refrigerating side, in addition to the constant pressure expansion valve 5b, a temperature-actuated normal expansion valve or a combination of a solenoid valve and a fixed throttle can be used.

(4) Needless to say, as the cold storage material, an appropriate eutectic solution having a freezing temperature of 0 ° C. or lower may be used instead of water.

〔The invention's effect〕

As described above, according to the present invention, the regenerator material in which the regenerator material is sealed in the bag body is cooled and frozen by the evaporator that is in close contact with the outer surface thereof. Therefore, the evaporator is installed in the regenerator. Compared with the structure, the regenerator material can be easily sealed and the bag can be easily deformed, so that the assembling work of the entire refrigerator can be facilitated and the manufacturing cost can be reduced. Furthermore, if the cold storage temperature is below the freezing temperature, the blower will operate,
Since the heat storage function of the cold storage material is promoted, the inside of the cold storage is effectively kept cool, and when the cold storage material is above the freezing temperature, the unnecessary operation of the blower is stopped, so that the on-board battery is overheated. Discharge is prevented.

[Brief description of drawings]

Each of the drawings shows an embodiment of the present invention. FIG. 1 is an exploded perspective view of a refrigerator, FIG. 2 is a rear perspective view of an automobile showing a place where the refrigerator is installed, and FIG.
FIG. 4 is a perspective view showing a state in which the lid body 4 is attached to and used as a cold insulation box, FIG. 4 is a sectional view taken along the line II of FIG. 1, and FIG. 5 is a sectional view taken along the line II-II of FIG. 6, FIG. 6 is a sectional view taken along the line III-III in FIG. 5, FIG. 7 is an enlarged view of IV portion in FIG. 6, FIG. 8 is an electric circuit diagram of the fan motor 10, and FIG. 9 is a perspective view of the fan 11. Figure,
FIG. 10 is a sectional view of the arm portion 11c of FIG. 9, and FIG. 11 is a refrigeration cycle diagram of the present invention, which includes an electric circuit. 12 is a vertical sectional view of the compressor 21 of FIG. 11, FIG. 13 is a partial sectional side view of FIG. 12, FIG. 14 is a Mollier diagram of the refrigeration cycle,
FIG. 15 shows another embodiment of the refrigerator, and is a longitudinal sectional view with the door opened, and FIG. 16 is a schematic perspective view showing the form of the piping of the evaporator in the refrigerator of FIG. 1 ... Cooling unit, 2 ... Cooling unit, 1b, 4, 103 ...
… Lid, 6,18,100 …… Case, 5d …… Refrigerating evaporator, 5e
...... Cold storage.

Claims (1)

[Claims] 1. A heat-insulating case having an openable / closable lid, a refrigerating cooler installed in the case and having a regenerator material sealed in a bag body, and in close contact with the refrigerating cooler in the case. And a refrigerating evaporator provided branching from a refrigeration cycle having a cooling evaporator, and an evaporating pressure in the refrigerating evaporator is set to a low value capable of freezing the regenerator material of the regenerator. Means, a temperature detector for detecting the surface temperature of the refrigerating evaporator or its related temperature, and a blower provided in the case and driven by an on-vehicle battery, wherein the blower is the temperature detector. A refrigerator for a vehicle, which is operated when a detected temperature is equal to or lower than a freezing temperature of the cold storage material.